<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="" method="post">
        姓名:<input type="text" name="username" placeholder="请输入姓名..." required="required">
        <br/>
        手机号:<input type="text" name="tel" placeholder="请输入11位手机号码...">
        <br/>
        邮箱:<input type="text" name="email" placeholder="请输入邮箱...">
        <br/>
        <input type="submit" value="提交">
    </form>
</body>
</html>
